ATE40604T1 - CURRENT DETECTOR CIRCUIT. - Google Patents

CURRENT DETECTOR CIRCUIT.

Info

Publication number
ATE40604T1
ATE40604T1 AT84110994T AT84110994T ATE40604T1 AT E40604 T1 ATE40604 T1 AT E40604T1 AT 84110994 T AT84110994 T AT 84110994T AT 84110994 T AT84110994 T AT 84110994T AT E40604 T1 ATE40604 T1 AT E40604T1
Authority
AT
Austria
Prior art keywords
current
compensation
cores
amplifier
flux
Prior art date
Application number
AT84110994T
Other languages
German (de)
Inventor
Hans-Erik Jorgensen
Original Assignee
Danfysik As
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Danfysik As filed Critical Danfysik As
Application granted granted Critical
Publication of ATE40604T1 publication Critical patent/ATE40604T1/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
    • G01R15/183—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core
    • G01R15/185—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core with compensation or feedback windings or interacting coils, e.g. 0-flux sensors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/18—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using conversion of DC into AC, e.g. with choppers
    • G01R19/20—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using conversion of DC into AC, e.g. with choppers using transductors, i.e. a magnetic core transducer the saturation of which is cyclically reversed by an AC source on the secondary side

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Measuring Volume Flow (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

For the measurement of large currents, d.c. as well as a.c., a so called zero-flux current transformer may be used. It comprises two identically wound toroidal cores (11,12), in which the magnetic flux induced by a main or primary current (I1) is neutralized by a counter-flux induced by a compensation current (I2), which by means of an amplifier circuit (40) is passed through a compensation winding (14) common for both cores (11,12) and having many turns. The compensation current (I2) is adjusted by means of the amplifier (40) to such a value, that the mean flux in the cores (11,12) is zero. The intensity of the compensation current (I2) is measured by the voltage drop across a measuring resistor (15). Any unbalances between the primary and secondary ampere-turns are sensed by a detecting circuit comprising a sensing winding (21,22) wound on each core (11,12) and divided into two subwindings which carries a magnetizing current (I3) from a current source (23) in such a way, that the odd-harmonic components contained in the magnetizing current are outbalanced, whilst the even-harmonic components contained therein are added and conducted to a synchronous rectifier (32) to provide a control signal to the amplifier (40) for the adjusting of the compensation current (I2). <??>Hereby is obtained a largely improved signal-to-noise ratio for the signal applied to the synchronous rectifier (32), and the need for a complex and expensive active 2nd-harmonic filter is eliminated.
AT84110994T 1983-09-15 1984-09-14 CURRENT DETECTOR CIRCUIT. ATE40604T1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK421683A DK149238C (en) 1983-09-15 1983-09-15 DETECTOR CIRCUIT FOR USE IN POWER METERING
EP84110994A EP0137347B1 (en) 1983-09-15 1984-09-14 A detector circuit for current measurements

Publications (1)

Publication Number Publication Date
ATE40604T1 true ATE40604T1 (en) 1989-02-15

Family

ID=8131391

Family Applications (1)

Application Number Title Priority Date Filing Date
AT84110994T ATE40604T1 (en) 1983-09-15 1984-09-14 CURRENT DETECTOR CIRCUIT.

Country Status (6)

Country Link
US (1) US4616174A (en)
EP (1) EP0137347B1 (en)
JP (1) JPS60173477A (en)
AT (1) ATE40604T1 (en)
DE (1) DE3476586D1 (en)
DK (1) DK149238C (en)

Families Citing this family (50)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3521546A1 (en) * 1985-06-15 1986-12-18 LGZ Landis & Gyr Zug AG, Zug ELECTRIC OVERLOAD INDICATOR
US4749940A (en) * 1986-12-22 1988-06-07 General Electric Company Folded bar current sensor
US4761605A (en) * 1986-12-22 1988-08-02 General Electric Company Input switching in electronic watthour meter
US4899103A (en) * 1987-07-16 1990-02-06 Brooktree Corporation Current meter
US4841236A (en) * 1988-03-22 1989-06-20 Canadian Patents And Development Limited-Societe Canadienne Des Brevets Et D'exploitation Limitee Current ratio device
ATE127590T1 (en) * 1988-08-24 1995-09-15 Liaison Electroniques Mecaniqu CURRENT SENSOR.
US5041780A (en) * 1988-09-13 1991-08-20 California Institute Of Technology Integrable current sensors
US5066904A (en) * 1988-10-18 1991-11-19 General Electric Company Coaxial current sensors
US4970459A (en) * 1988-12-02 1990-11-13 General Electric Company Electronic meter chopper stabilization
DE3940932A1 (en) * 1989-12-12 1991-06-13 Ulrich Doerr Measurement transducer for simultaneous measurement of AC and DC - has two soft magnetic cores, modulation coils and detection coil and uses periodic modulation current
GB2244142A (en) * 1990-05-16 1991-11-20 Westinghouse Brake & Signal Current transformer measuring circuits
CH684216A5 (en) * 1991-02-15 1994-07-29 Lem Liaisons Electron Mec Device for measuring currents.
FI90142C (en) * 1992-04-02 1993-12-27 Abb Stroemberg Drives Oy ENLIGGED COMPENSATION SPEED FACTORY FOUNDATION FOER STROEM
FI98411C (en) * 1993-08-20 1997-06-10 Picker Nordstar Oy Improved power source
EP0686850A1 (en) * 1994-06-09 1995-12-13 Lem S.A. DC current measuring circuit with voltage isolation between current path and measuring circuit
US5568047A (en) * 1994-08-10 1996-10-22 General Electric Company Current sensor and method using differentially generated feedback
FR2753594B1 (en) * 1996-09-17 1998-12-11 Sagem LINE INTERFACE FAX MACHINE WITH SINGLE SENSOR AND CURRENT SENSOR WITH MAGNETIC DETECTION AND COMPENSATION CIRCUITS
JP3583586B2 (en) * 1997-07-22 2004-11-04 株式会社東芝 Power converter control device
US6175255B1 (en) * 1998-11-23 2001-01-16 National Seniconductor Corporation Line driver circuit for low voltage and low power applications
FR2788344B1 (en) * 1999-01-12 2001-03-30 Peugeot Citroen Automobiles Sa DEVICE FOR MEASURING A CURRENT FLOWING IN A CONDUCTOR
US6522517B1 (en) 1999-02-25 2003-02-18 Thomas G. Edel Method and apparatus for controlling the magnetization of current transformers and other magnetic bodies
US6246593B1 (en) * 1999-05-06 2001-06-12 Astec International Limited Topology-independent synchronous rectifier commutation circuit
US6356421B1 (en) * 1999-11-29 2002-03-12 Schweitzer Engineering Labs., Inc. System for power transformer differential protection
JP2001201521A (en) * 2000-01-18 2001-07-27 Agilent Technologies Japan Ltd Current detecting device and impedance measuring apparatus and power measuring device
DE60222594T2 (en) * 2002-06-25 2008-06-19 Grno, Ladislav, Dr. CIRCUIT FOR SIMULTANEOUS TESTING OF ELECTRICITY METERS WITH CONNECTED ELECTRICITY AND VOLTAGE INPUTS
WO2004013951A2 (en) * 2002-08-05 2004-02-12 Engineering Matters, Inc. Self-powered direct current mitigation circuit for transformers
US6954060B1 (en) 2003-03-28 2005-10-11 Edel Thomas G a-c current transformer functional with a d-c current component present
EP1807707B1 (en) * 2004-11-05 2010-09-22 Liaisons Electroniques-Mècaniques LEM S.A. Detector circuit for measuring current
DK200500029A (en) * 2005-01-07 2006-07-08 Danfysik As Detector circuit for use in current measurement
CN100432680C (en) * 2005-08-24 2008-11-12 珠海市科荟电器有限公司 Forcipated mutual-inductor, forcipated ammeter and verification method of forcipated ammeter
US8619443B2 (en) 2010-09-29 2013-12-31 The Powerwise Group, Inc. System and method to boost voltage
US8085009B2 (en) 2007-08-13 2011-12-27 The Powerwise Group, Inc. IGBT/FET-based energy savings device for reducing a predetermined amount of voltage using pulse width modulation
US8085010B2 (en) 2007-08-24 2011-12-27 The Powerwise Group, Inc. TRIAC/SCR-based energy savings device for reducing a predetermined amount of voltage using pulse width modulation
US8120307B2 (en) 2007-08-24 2012-02-21 The Powerwise Group, Inc. System and method for providing constant loading in AC power applications
US8698447B2 (en) 2007-09-14 2014-04-15 The Powerwise Group, Inc. Energy saving system and method for devices with rotating or reciprocating masses
US8810190B2 (en) 2007-09-14 2014-08-19 The Powerwise Group, Inc. Motor controller system and method for maximizing energy savings
JP5340639B2 (en) * 2008-05-22 2013-11-13 ローム株式会社 Capacitor charging device, control circuit thereof, control method, and light emitting device and electronic apparatus using the same
US8004255B2 (en) 2008-08-07 2011-08-23 The Powerwise Group, Inc. Power supply for IGBT/FET drivers
US8159240B2 (en) * 2009-01-09 2012-04-17 Tdk Corporation Bulk current injection (BCI) probe with multiple, symmetrically spaced feeds
US8698446B2 (en) 2009-09-08 2014-04-15 The Powerwise Group, Inc. Method to save energy for devices with rotating or reciprocating masses
WO2011031603A1 (en) 2009-09-08 2011-03-17 The Powerwise Group, Inc. Energy saving system and method for devices with rotating or reciprocating masses
US9155585B2 (en) * 2010-01-12 2015-10-13 Syntheon, Llc Battery-powered electrosurgical forceps with multi-turn selectable-ratio transformer
CN103901252B (en) * 2014-04-08 2018-11-02 烟台市华能电器有限公司 10KV power transmission line zero-sequence current detecting systems
JP6625395B2 (en) * 2015-10-26 2019-12-25 日置電機株式会社 Current sensors and measuring devices
CN105510679A (en) * 2016-01-21 2016-04-20 江苏省电力公司电力科学研究院 High-reliability and high-precision current measuring method and device
US9618541B1 (en) * 2016-04-20 2017-04-11 Neilsen-Kuljian, Inc. Apparatus, method and device for sensing DC currents
CN114035114A (en) * 2016-06-06 2022-02-11 韦巴斯托充电***公司 Residual Current Detection (RCD) and ground impedance monitoring transformer and control method
FR3060757B1 (en) * 2016-12-19 2020-11-06 Safran Electronics & Defense FLOW VALVE CURRENT SENSOR
JP6829139B2 (en) * 2017-04-11 2021-02-10 日置電機株式会社 Current sensor and measuring device
FR3083321B1 (en) * 2018-06-27 2021-03-05 Safran Electronics & Defense FLOW VALVE CURRENT SENSOR

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1345869A (en) * 1971-11-30 1974-02-06 Secr Defence Electrical current measuring instruments
US3801907A (en) * 1972-10-12 1974-04-02 M Lilienstein Direct current measurement
US4274051A (en) * 1979-07-27 1981-06-16 Bell Telephone Laboratories, Incorporated Electromagnetic arrangement for measuring electrical current
US4278939A (en) * 1979-07-27 1981-07-14 Bell Telephone Laboratories, Incorporated Electromagnetic arrangement for measuring electrical current

Also Published As

Publication number Publication date
EP0137347B1 (en) 1989-02-01
DK421683A (en) 1985-03-16
US4616174A (en) 1986-10-07
DE3476586D1 (en) 1989-03-09
EP0137347A1 (en) 1985-04-17
DK149238B (en) 1986-04-01
DK149238C (en) 1987-01-19
DK421683D0 (en) 1983-09-15
JPS60173477A (en) 1985-09-06

Similar Documents

Publication Publication Date Title
ATE40604T1 (en) CURRENT DETECTOR CIRCUIT.
US7145321B2 (en) Current sensor with magnetic toroid
GB913780A (en) Method of obtaining an electrical signal proportional to the cross-sectional area of a magnetic tube or rod
US4274052A (en) Current meter using core saturation
JPH11281678A (en) Current sensor
JPH0618568A (en) Current sensor
JPH027031B2 (en)
JPS6395363A (en) Current sensor and method of detecting current in conductor to be evaluated
US5831424A (en) Isolated current sensor
JPH073345Y2 (en) DC current detector
JPS5633521A (en) Device for measuring stress
US2790950A (en) Determining the permeability of magnetic material
JPS56147086A (en) Flux gate type magnetic sensor
US2526338A (en) Electrical testing instrument
SU932385A1 (en) Device for eddy-current checking
SU1265627A1 (en) Device for contactless measurement of current intensity
Adams A Simple Field Detector for a Dc Permeameter
SU798653A1 (en) Apparatus for measuring ferromagnetic characteristics of ferromagnetic materials
JPS568575A (en) Magnetism tester
SU546024A1 (en) Device for measuring electron beam current
SU866514A1 (en) Magnetometer
US2911589A (en) Measuring system for measuring magnetic flux as a function of exciting current
SU900230A1 (en) Coercimeter
DE3783869D1 (en) FLOW-COMPENSATED CURRENT TRANSFORMER.
SU972264A1 (en) Device for measuring temperature of dc electrical machine winding

Legal Events

Date Code Title Description
RER Ceased as to paragraph 5 lit. 3 law introducing patent treaties